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Originally Posted by Jerry Jensen
A solid object is not required to create a background spectrum
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Not solid, but the source must be opaque for a blackbody SED. The heliopause region is not anywhere near opaque and thus can not produce a spectrum resembling even the raw CMB.
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I think we can agree the optical depth is not an issue if we are talking about a microwave spectrum that is little more than a whisper.
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Considering the SED it has, no way we can agree on that.
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What I am really talking about is a solar SZ effect: Inverse Compton scattering.
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The upper limit on the Compton y-parameter is very strict from FIRAS. There's no evidence of it in the CMB.